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Sifat Jubaira: Effect of Prolonged Tourniquet Application 
Sifat Jubaira/LinkedIn
Feb 2, 2026, 17:16

Sifat Jubaira: Effect of Prolonged Tourniquet Application 

Sifat Jubaira, Lab Medicine Specialist at United Hospital Limited, shared a post on LinkedIn:

“Effect of Prolonged Tourniquet Application 

Prolonged tourniquet application (typically >1 minute) causes venous stasis, leading to hemoconcentration and localized metabolic changes. This is a well-documented pre-analytical error.

Proven Laboratory Effects

Falsely Increased

  • Total protein, Albumin
  • Calcium (protein-bound fraction)
  • Hemoglobin, Hematocrit
  • RBC, WBC, Platelet counts
  • Potassium (especially with fist clenching)
  • Lactate
  • AST, CK

Falsely Decreased

  • Glucose (local cellular uptake)
  • pH (local acidosis)

Why this happens?

  • Venous stasis causes plasma water to shift into interstitial space, while cells and large molecules remain intravascular → concentration effect.

Why it matters?

  • Pseudohypercalcaemia
  • Misinterpretation of dehydration
  • Unnecessary repeat testing or inappropriate clinical decisions

Best-Practice Recommendation

  • Apply tourniquet for ≤ 1 minute
  • Release as soon as blood flow is established
  • Avoid fist clenching

If delay occurs, release and reapply after 2 minutes.

Authoritative Sources

  1. CLSI GP41-Ed7 (2020)
    Collection of Diagnostic Venous Blood Specimens.
  2. WHO Guidelines on Drawing Blood (2010).
  3. McPherson & Pincus. Henry’s Clinical Diagnosis and Management by Laboratory Methods, 23rd ed.
  4. Lippi G et al. Preanalytical variability in laboratory testing. Clin Chem Lab Med.

Pre-analytical accuracy is patient safety.

Sifat Jubaira: Effect of Prolonged Tourniquet Application 

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Health Hematology Hemostasis News Hemostasis Today Medical News Medicine Prolonged Tourniquet Application Sifat Jubaira thrombosis Venous stasis
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